<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>姓名案例_计算属性实现</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    
    <div id="root">
        姓:<input type="text" v-model="firstName"></input><br><br>
        名:<input type="text" v-model="lastName"></input><br><br>
        全名:<span>{{fullName}}</span>
        
        
    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el:'#root',
            data:{
                firstName:'张',
                lastName:'三'
            },
            computed:{
                //完整写法
                /*
                fullName:{
                    get(){
                        console.log('get被调用了');
                        return this.firstName+'-'+this.lastName;
                    },
                    set(value){
                        console.log('set',value);
                        const arr = value.split('-')
                        this.firstName = arr[0]
                        this.lastName = arr[1]
                    }
                }
                */
               //简写   前提是只有getter没有setter
               fullName(){
                    console.log('get被调用了');
                    return this.firstName+'-'+this.lastName;
                }
                
            }
        })

    </script>
</body>
</html>